JPWO2003094271A1 - Coolant composition for fuel cell - Google Patents
Coolant composition for fuel cell Download PDFInfo
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- JPWO2003094271A1 JPWO2003094271A1 JP2004502391A JP2004502391A JPWO2003094271A1 JP WO2003094271 A1 JPWO2003094271 A1 JP WO2003094271A1 JP 2004502391 A JP2004502391 A JP 2004502391A JP 2004502391 A JP2004502391 A JP 2004502391A JP WO2003094271 A1 JPWO2003094271 A1 JP WO2003094271A1
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
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- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
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- C09K5/10—Liquid materials
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/20—Antifreeze additives therefor, e.g. for radiator liquids
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/12—Oxygen-containing compounds
- C23F11/122—Alcohols; Aldehydes; Ketones
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04029—Heat exchange using liquids
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
本発明は、燃料電池の冷却に使用される冷却液組成物に関し、詳細には低導電率、不凍性、及び燃料電池の冷却系統に使用されている金属、特にはアルミニウム系材料に優れた腐食防止性を有し、さらに長期の使用においても導電率が上昇しにくい燃料電池用冷却液組成物に関する。本発明の燃料電池用冷却液組成物であって、基剤と、前記冷却液組成物の導電率を低導電率に維持する添加剤とを含有しており、前記防錆添加剤が、基剤の酸化を抑制して、又は冷却システム内に溶出するイオンを封鎖して、前記冷却液組成物の導電率の上昇を防止する物質であることを特徴とするものである。The present invention relates to a coolant composition used for cooling a fuel cell, and in particular, has low conductivity, antifreeze, and excellent metal, particularly aluminum-based material, used in a fuel cell cooling system. The present invention relates to a coolant composition for a fuel cell that has corrosion prevention properties and is less likely to increase in electrical conductivity even when used for a long time. A coolant composition for a fuel cell according to the present invention, comprising a base and an additive for maintaining the electrical conductivity of the coolant composition at a low electrical conductivity. It is a substance that suppresses the oxidation of the agent or blocks ions eluted in the cooling system to prevent an increase in the conductivity of the cooling liquid composition.
Description
技術分野
本発明は、燃料電池、特には自動車用燃料電池の冷却に使用される冷却液組成物に関し、詳細には長期に亘って当該冷却液組成物を低導電率に維持すると共に不凍性、防錆性に優れる燃料電池用冷却液組成物に関する。
背景技術
燃料電池は、一般に発電単位である単セルを多数積層した構造のスタックとして構成されている。発電時にはスタックから熱が発生するので、このスタックを冷却するために数セル毎に冷却板が挿入されていた。
冷却板内部には冷却液通路が形成されており、この通路を冷却液が流れることにより、スタックが冷却されるようになっていた。
このように、燃料電池の冷却液は、発電を実行しているスタック内を循環してスタックを冷却するため、冷却液の電気伝導率が高いと、スタックで生じた電気が冷却液側へと流れて電気を損失し、該燃料電池における発電力を低下させることになる。
そこで、従来の燃料電池の冷却液には、導電率が低い、換言すれば電気絶縁性が高い純水が使用されていた。
ところが、例えば自動車用燃料電池など、間欠運転型燃料電池の場合、非作動時に冷却液は周囲の温度まで低下してしまう。特に氷点下での使用可能性がある場合、純水では凍結してしまい、冷却液の体積膨張による冷却板の破損など、燃料電池の電池性能を損なう恐れがあった。
また、自動車用燃料電池等の冷却システムを考慮した場合、軽量化の観点から、冷却板や熱交換器などにはアルミ系材料が使用されることが予測される。アルミ系材料は防錆性に乏しく、腐食を発生し易く、腐食が発生した場合、導電率が上昇することになる。
このような事情から、燃料電池、特には自動車用燃料電池の冷却液には、低導電性、不凍性、及び防錆性が要求される。
本発明者は、上記要求に対応することができる燃料電池用冷却液組成物について鋭意研究を重ねた結果、本発明を完成するに至ったのである。
すなわち本発明は、長期に亘って当該冷却液組成物を低導電率に維持すると共に、不凍性、防錆性に優れる燃料電池用冷却液組成物を提供することを目的とするものである。
発明の開示
以下、本発明の燃料電池用冷却液組成物(以下、単に組成物という)をさらに詳しく説明する。本発明の組成物は基剤と防錆添加剤とを含有している。基剤としては、低導電率であって、不凍性を有するものが望ましい。具体的には水、グリコール類、アルコール類及びグリコールエーテル類の中から選ばれる1種若しくは2種以上からなるものが好ましい。
グリコール類としては、例えばエチレングリコール、ジエチレングリコール、トリエチレングリコール、プロピレングリコール、1,3−プロパンジオール、1,3−ブタンジオール、1,5−ペンタンジオール、ヘキシレングリコールの中から選ばれる1種若しくは2種以上からなるものを挙げることができる。
アルコール類としては、例えばメタノール、エタノール、プロパノール、ブタノール、ペンタノール、ヘキサノール、ヘプタノール、オクタノールの中から選ばれる1種若しくは2種以上からなるものを挙げることができる。
グリコールエーテル類としては、例えばエチレングリコールモノメチルエーテル、ジエチレングリコールモノメチルエーテル、トリエチレングリコールモノメチルエーテル、テトラエチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、ジエチレングリコールモノエチルエーテル、トリエチレングリコールモノエチルエーテル、テトラエチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールモノブチルエーテル、トリエチレングリコールモノブチルエーテル、テトラエチレングリコールモノブチルエーテルの中から選ばれる1種若しくは2種以上からなるものを挙げることができる。
本発明の防錆添加剤は、これを基剤中に添加したとき、該組成物が、燃料電池における発電力を低下させない程度の導電率(低導電率)に維持されるようになっている。具体的には、該防錆添加剤を基剤中に添加したとき、組成物の導電率を10μS/cm以下に維持する。またこの防錆添加剤は、長期に亘って使用した場合でも、長期の使用による組成物の導電率の変動を、0乃至10μS/cmの範囲内に維持する。
この防錆添加剤は、基剤の酸化を抑制して、冷却液組成物の導電率の上昇を防止する物質、又は冷却システム内に溶出するイオンを封鎖して、前記冷却液組成物の導電率の上昇を防止する物質である。
基剤の酸化を抑制して、導電率の上昇を防止する物質としては、例えばフェノールスルホン酸、クロロフェノール、ニトロフェノール、ブロモフェノール、アミノフェノール、ジヒドロキシベンゼン、オキシン、ヒドロキシアセトフェノン、メトキシフェノール、2,6−ジ−tert−ブチル−p−クレゾール、tert−ブチル−4−メトキシフェノール、2,6−ジ−tert−ブチル−4−エチルフェノール、4,4−ブチリデンビス−(3−メチル−6−tert−ブチルフェノール)、2,2−メチレンビス−(4−メチル−6−tert−ブチルフェノール、2,2−ビス(p−ヒドロキシフェニル)プロパンの中から選ばれる1種若しくは2種以上からなるフェノール化合物を挙げることができる。
イオンを封鎖して、導電率の上昇を防止する物質としては、炭化水素カルボニル化合物、アミド化合物、イミド化合物、及びジアゾール化合物のいずれかを挙げることができる。
炭化水素カルボニル化合物としては、例えば2,4−ペンタンジオン、3−メチル−2,4−ペンタンジオン、3−エチル−2,4−ペンタンジオン、3−プロピル−2,4−ペンタンジオン、3−n−ブチル−2,4−ペンタンジオン、2,3−ヘプタンジオン、2,5−ヘキサンジオン、フタルアルデヒド、ベンズアルデヒド、ジヒドロキシベンズアルデヒド、ペンタノン、2−アセチルシクロペンタノン、シクロヘキサノン、シクロヘキサンジオン、2,2,6,6−テトラメチル−3,5−ヘプタンジオンの中から選ばれる1種若しくは2種以上からなるものを挙げることができる。
アミド化合物としては、例えばベンズアミド、メチルベンズアミド、ニコチン酸アミド、ピコリン酸アミド、アントラニルアミド、コハク酸アミド、シュウ酸ジアミド、アセトアミド、2−ピロリドン、カプロラクタムの中から選ばれる1種若しくは2種以上からなるものを挙げることができる。
イミド化合物としては、例えばコハク酸イミド、フタル酸イミド、マレイン酸イミド、グルタル酸イミド、1,8−ナフタルイミド、アロキサン、プルプル酸の中から選ばれる1種若しくは2種以上からなるものを挙げることができる。
ジアゾール化合物としては、例えばイミダゾリン、1,3−ジアゾール、メルカプトイミダゾリン、メルカプトイミダゾール、ベンズイミダゾール、メルカプトベンズイミダゾール、メチルイミダゾール、ジメチルイミダゾール、イミダゾール−4,5−ジカルボン酸、1,2−ジアゾール、メチルピラゾールの中から選ばれる1種若しくは2種以上からなるものを挙げることができる。
防錆添加剤の含有量としては、基剤に対し、0.001乃至10.0重量%の範囲とするのが望ましい。上記範囲よりも防錆添加剤の含有量が少ない場合には、充分な防錆性を得ることができず、上記範囲よりも防錆添加剤の含有量が多い場合には、増えた分だけの効果が得られず、不経済となる。
なお、本発明の組成物には、前記の成分以外に例えば消泡剤、着色剤等を含有させても良いし、他の従来公知の防錆添加剤である、モリブデン酸塩、タングステン酸塩、硫酸塩、硝酸塩及び安息香酸塩などを該組成物の低導電率を阻害しない範囲で併用しても良い。
実施例
以下、本発明の組成物を実施例に従いさらに詳しく説明する。下記表1には、この組成物の好ましい実施例として例1〜例6を示すとともに、比較として従来技術であるイオン交換水のみ(比較例1)、イオン交換水を基剤とし、これに不凍性を持たせる目的でエチレングリコールを加えたもの(比較例2)、比較例2に公知の防錆添加剤として、トリエタノールアミンを添加したもの(比較例3)を挙げた。
上記表1に示す実施例1乃至実施例6、並びに比較例1乃至比較例3の各サンプルについて、導電率、凍結温度、及び金属腐食試験を行った。その結果を表2に示す。尚、金属腐食試験は、JIS K 2234 7.8の規定に基づいて行い、この試験に供する金属には、アルミ系材料への防錆性及び長期使用を考慮し、試験片はアルミニウム鋳物(AC−2A)のみを浸漬し、88℃に加熱し、空気吹き込みの中、1000時間実施した。
表2から、実施例1乃至6並びに比較例1乃至3の組成物は、いずれも初期の導電率は5μS/cm以下と低導電率を示しているが、1000時間の金属腐食試験後の導電率を見てみると、比較例1乃至3の組成物は、いずれも導電率が上昇し、比較例1が25.5、比較例2が37.8となり、比較例3に至っては78.5と大幅に導電率が上昇している。これに対し、実施例1乃至6の組成物は、1.0乃至9.6の範囲に留まっていて低導電率が維持されていることが確認された。
また、アルミ鋳物の質量変化(mg/cm2)については、比較例1乃至3が、−0.18、−0.15、−0.54と大きな質量変化を示しているのに対し、実施例1乃至6は、−0.02乃至+0.02の範囲と小さく、比較例のものに比べてアルミへの防食性が優れていることが確認された。また、凍結温度については、実施例1乃至6のいずれもが氷点以下であった。
発明の効果
本発明の組成物は、基剤と、前記冷却液組成物の導電率を低導電率に維持する防錆添加剤とを含有しており、前記防錆添加剤が、基剤の酸化を抑制して、又は冷却システム内に溶出するイオンを封鎖して、前記冷却液組成物の導電率の上昇を防止する物質であることから、長期に亘って当該冷却液組成物を低導電率に維持すると共に、不凍性、防錆性に優れる。TECHNICAL FIELD The present invention relates to a coolant composition used for cooling a fuel cell, particularly an automobile fuel cell, and more particularly, to maintain the coolant composition at a low conductivity and antifreeze for a long period of time. The present invention relates to a fuel cell coolant composition having excellent antirust properties.
BACKGROUND ART A fuel cell is generally configured as a stack having a structure in which a large number of single cells as power generation units are stacked. Since heat is generated from the stack during power generation, a cooling plate is inserted every several cells to cool the stack.
A coolant passage is formed inside the cooling plate, and the stack is cooled by the flow of the coolant through the passage.
In this way, the coolant of the fuel cell circulates in the stack that is generating power to cool the stack, so if the electrical conductivity of the coolant is high, the electricity generated in the stack will move to the coolant side. It flows and loses electricity, and the power generation in the fuel cell is reduced.
Therefore, pure water having low electrical conductivity, in other words, high electrical insulation, has been used as a conventional fuel cell coolant.
However, in the case of an intermittent operation type fuel cell such as a fuel cell for an automobile, for example, the coolant is lowered to the ambient temperature when it is not operated. In particular, when there is a possibility of use below freezing point, there is a possibility that the battery performance of the fuel cell is impaired, such as freezing in pure water and damage to the cooling plate due to volume expansion of the coolant.
In consideration of a cooling system such as an automobile fuel cell, it is predicted that an aluminum-based material is used for a cooling plate, a heat exchanger, and the like from the viewpoint of weight reduction. Aluminum-based materials are poor in rust prevention properties and are susceptible to corrosion. If corrosion occurs, the electrical conductivity will increase.
Under such circumstances, low conductivity, antifreeze, and rust prevention are required for the coolant of a fuel cell, particularly an automobile fuel cell.
As a result of intensive studies on the coolant composition for fuel cells that can meet the above requirements, the present inventors have completed the present invention.
That is, an object of the present invention is to provide a fuel cell coolant composition that maintains the coolant composition at a low conductivity over a long period of time and is excellent in antifreeze and rust prevention properties. .
DISCLOSURE OF THE INVENTION Hereinafter, the fuel cell coolant composition (hereinafter simply referred to as the composition) of the present invention will be described in more detail. The composition of the present invention contains a base and an antirust additive. As the base material, a material having low electrical conductivity and having antifreezing properties is desirable. Specifically, those composed of one or more selected from water, glycols, alcohols and glycol ethers are preferred.
Examples of glycols include one selected from ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,5-pentanediol, and hexylene glycol, or The thing which consists of 2 or more types can be mentioned.
Examples of alcohols include one or more selected from methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, and octanol.
Examples of glycol ethers include ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, tetraethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, triethylene glycol monoethyl ether, tetraethylene glycol monomethyl ether. Examples thereof include one or more selected from ethyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, and tetraethylene glycol monobutyl ether.
When the rust preventive additive of the present invention is added to the base, the composition is maintained at a conductivity (low conductivity) that does not decrease the power generation in the fuel cell. . Specifically, when the rust preventive additive is added to the base, the electrical conductivity of the composition is maintained at 10 μS / cm or less. Moreover, even when this anticorrosive additive is used over a long period of time, the fluctuation of the electrical conductivity of the composition due to long-term use is maintained within the range of 0 to 10 μS / cm.
This rust preventive additive suppresses the oxidation of the base and prevents the increase in the conductivity of the coolant composition, or blocks ions that elute in the cooling system, thereby preventing the conductivity of the coolant composition. It is a substance that prevents the rate from rising.
Examples of substances that suppress the oxidation of the base and prevent an increase in conductivity include phenolsulfonic acid, chlorophenol, nitrophenol, bromophenol, aminophenol, dihydroxybenzene, oxine, hydroxyacetophenone, methoxyphenol, 2, 6-di-tert-butyl-p-cresol, tert-butyl-4-methoxyphenol, 2,6-di-tert-butyl-4-ethylphenol, 4,4-butylidenebis- (3-methyl-6-tert -Butylphenol), 2,2-methylenebis- (4-methyl-6-tert-butylphenol), phenol compounds composed of one or more selected from 2,2-bis (p-hydroxyphenyl) propane be able to.
Examples of the substance that blocks ions and prevents the increase in conductivity include hydrocarbon carbonyl compounds, amide compounds, imide compounds, and diazole compounds.
Examples of the hydrocarbon carbonyl compound include 2,4-pentanedione, 3-methyl-2,4-pentanedione, 3-ethyl-2,4-pentanedione, 3-propyl-2,4-pentanedione, 3- n-butyl-2,4-pentanedione, 2,3-heptanedione, 2,5-hexanedione, phthalaldehyde, benzaldehyde, dihydroxybenzaldehyde, pentanone, 2-acetylcyclopentanone, cyclohexanone, cyclohexanedione, 2,2 , 6,6-tetramethyl-3,5-heptanedione, or one or more selected from the group consisting of 2,6-heptanedione.
Examples of the amide compound include one or more selected from benzamide, methylbenzamide, nicotinic acid amide, picolinic acid amide, anthranilamide, succinic acid amide, oxalic acid diamide, acetamide, 2-pyrrolidone, and caprolactam. Things can be mentioned.
Examples of the imide compound include those composed of one or more selected from succinimide, phthalic imide, maleic imide, glutaric imide, 1,8-naphthalimide, alloxan, and purpuric acid. Can do.
Examples of the diazole compound include imidazoline, 1,3-diazole, mercaptoimidazoline, mercaptoimidazole, benzimidazole, mercaptobenzimidazole, methylimidazole, dimethylimidazole, imidazole-4,5-dicarboxylic acid, 1,2-diazole, methylpyrazole. The thing which consists of 1 type, or 2 or more types chosen from among these can be mentioned.
The content of the rust preventive additive is preferably in the range of 0.001 to 10.0% by weight with respect to the base. When the content of the rust preventive additive is less than the above range, sufficient rust preventive properties cannot be obtained, and when the content of the rust preventive additive is larger than the above range, only the increased amount is obtained. The effect of is not obtained, it becomes uneconomical.
In addition to the above-mentioned components, the composition of the present invention may contain, for example, an antifoaming agent, a coloring agent, etc., and other conventionally known rust preventive additives, molybdate and tungstate. , Sulfates, nitrates, benzoates and the like may be used in combination as long as the low conductivity of the composition is not impaired.
EXAMPLES Hereinafter, the composition of the present invention will be described in more detail with reference to examples. Table 1 below shows Examples 1 to 6 as preferred examples of the composition, and as a comparison, only conventional ion exchange water (Comparative Example 1) is based on ion exchange water. The thing which added ethylene glycol for the purpose of giving freezing property (comparative example 2) and the thing which added triethanolamine as a well-known antirust additive in the comparative example 2 (comparative example 3) were mentioned.
The samples of Examples 1 to 6 and Comparative Examples 1 to 3 shown in Table 1 were subjected to electrical conductivity, freezing temperature, and metal corrosion test. The results are shown in Table 2. The metal corrosion test is performed based on the provisions of JIS K 2234 7.8. The metal used for this test is made of an aluminum casting (AC -2A) was immersed, heated to 88 ° C., and carried out for 1000 hours in air blowing.
Table 2 shows that the compositions of Examples 1 to 6 and Comparative Examples 1 to 3 all have low initial conductivity of 5 μS / cm or less, but the conductivity after 1000 hours of metal corrosion test. In terms of the ratio, the compositions of Comparative Examples 1 to 3 all have increased electrical conductivity, 25.5 for Comparative Example 1 and 37.8 for Comparative Example 2, and 78. The conductivity is significantly increased to 5. On the other hand, it was confirmed that the compositions of Examples 1 to 6 remained in the range of 1.0 to 9.6 and the low conductivity was maintained.
Moreover, about mass change (mg / cm < 2 >) of aluminum casting, although Comparative Examples 1 thru | or 3 showed large mass change with -0.18, -0.15, -0.54, it implemented. Examples 1 to 6 were as small as -0.02 to +0.02 and it was confirmed that the corrosion resistance to aluminum was superior to that of the comparative example. As for the freezing temperature, all of Examples 1 to 6 were below the freezing point.
Effect of the Invention The composition of the present invention contains a base and a rust preventive additive that maintains the conductivity of the coolant composition at a low conductivity. Since it is a substance that suppresses oxidation or blocks ions that elute into the cooling system and prevents an increase in the conductivity of the coolant composition, the coolant composition is kept low in conductivity over a long period of time. It is excellent in antifreeze and rust prevention.
Claims (14)
前記防錆添加剤が、基剤の酸化を抑制して、又は冷却システム内に溶出するイオンを封鎖して、前記冷却液組成物の導電率の上昇を防止する物質であることを特徴とする燃料電池用冷却液組成物。A coolant composition for cooling the fuel cell, comprising a base and a rust preventive additive for maintaining the conductivity of the coolant composition at a low conductivity,
The rust preventive additive is a substance that suppresses the oxidation of the base or blocks ions that elute into the cooling system to prevent an increase in conductivity of the coolant composition. A fuel cell coolant composition.
Applications Claiming Priority (1)
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PCT/JP2002/004413 WO2003094271A1 (en) | 2002-05-02 | 2002-05-02 | Cooling liquid composition for fuel cell |
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EP (1) | EP1501140A4 (en) |
JP (1) | JPWO2003094271A1 (en) |
CN (1) | CN1291515C (en) |
AU (1) | AU2002255302A1 (en) |
WO (1) | WO2003094271A1 (en) |
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JP4136591B2 (en) * | 2002-10-23 | 2008-08-20 | トヨタ自動車株式会社 | Cooling liquid, cooling liquid sealing method and cooling system |
AU2003248060A1 (en) * | 2003-07-11 | 2005-01-28 | Shishiai-Kabushikigaisha | Cooling fluid composition for fuel battery |
EP1739775B1 (en) * | 2004-03-24 | 2011-11-02 | Shishiai-Kabushikigaisha | Cooling fluid composition for fuel cell |
JP4785734B2 (en) * | 2004-03-30 | 2011-10-05 | シーシーアイ株式会社 | Heat medium composition |
EP1855340B1 (en) * | 2005-03-02 | 2011-09-07 | Shishiai-Kabushikigaisha | Coolant composition for fuel cell |
JP2006278199A (en) * | 2005-03-30 | 2006-10-12 | Cci Corp | Cooling liquid composition for fuel cell |
JP4981263B2 (en) * | 2005-03-30 | 2012-07-18 | シーシーアイ株式会社 | Coolant composition for fuel cell |
JP5713614B2 (en) | 2010-09-14 | 2015-05-07 | スズキ株式会社 | Fuel cell system and fuel cell vehicle |
KR101420746B1 (en) * | 2011-09-23 | 2014-07-21 | 극동제연공업 주식회사 | Cooling Liquid Composition for Fuel-Cell Comprising Hydroquinone or Quinoline |
CN109148915A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of fuel cell coolant liquid and its application |
CN108102616B (en) * | 2017-12-22 | 2020-06-26 | 扬州中德汽车零部件有限公司 | Low-conductivity ultra-long-efficiency anti-freezing cooling liquid for organic fuel cell and preparation method thereof |
CA3118615A1 (en) * | 2018-11-06 | 2020-05-14 | Basf Se | New antifreeze agents and coolants for fuel cells, storage batteries and batteries |
CN111218259B (en) * | 2018-11-27 | 2021-05-11 | 北京蓝星清洗有限公司 | New energy automobile power battery cooling liquid and preparation method thereof |
CN109762642B (en) * | 2018-12-29 | 2021-12-07 | 中国船舶重工集团公司第七一八研究所 | Low-conductivity cooling liquid and preparation method thereof |
CN110055039A (en) * | 2019-05-28 | 2019-07-26 | 上海大学 | A kind of high temperature corrosion-resisting fuel battery engines anti-icing fluid and preparation method thereof |
JP7192714B2 (en) * | 2019-08-26 | 2022-12-20 | トヨタ自動車株式会社 | Coolant composition and cooling system |
CN111748324A (en) * | 2020-07-08 | 2020-10-09 | 萱柯氢能科技(北京)有限公司 | Antifreeze fluid for metal bipolar plate fuel cell, preparation method and application |
CN113652210B (en) * | 2021-06-28 | 2024-04-02 | 中国船舶重工集团公司第七一八研究所 | Low-conductivity long-acting cooling liquid and preparation method thereof |
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US2002523A (en) * | 1932-07-23 | 1935-05-28 | Standard Oil Dev Co | Process of preventing corrosion |
US2071482A (en) * | 1934-01-31 | 1937-02-23 | Standard Oil Dev Co | Antifreeze |
US2197774A (en) * | 1938-02-09 | 1940-04-23 | Carbide & Carbon Chem Corp | Noncorrosive antifreeze liquid |
US3931031A (en) * | 1973-08-16 | 1976-01-06 | Caw Industries, Inc. | Surface active compositions |
JP4842420B2 (en) * | 1999-09-28 | 2011-12-21 | トヨタ自動車株式会社 | Cooling liquid, cooling liquid sealing method and cooling system |
-
2002
- 2002-05-02 WO PCT/JP2002/004413 patent/WO2003094271A1/en active Application Filing
- 2002-05-02 JP JP2004502391A patent/JPWO2003094271A1/en active Pending
- 2002-05-02 CN CNB028288556A patent/CN1291515C/en not_active Expired - Fee Related
- 2002-05-02 EP EP02724690A patent/EP1501140A4/en not_active Withdrawn
- 2002-05-02 AU AU2002255302A patent/AU2002255302A1/en not_active Abandoned
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EP1501140A1 (en) | 2005-01-26 |
AU2002255302A1 (en) | 2003-11-17 |
CN1291515C (en) | 2006-12-20 |
CN1625816A (en) | 2005-06-08 |
WO2003094271A1 (en) | 2003-11-13 |
EP1501140A4 (en) | 2010-05-19 |
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